In our cold storage, we need to use the air cooler. The cold air cooler in the cold storage is easy to frost. After frosting, it will easily affect the working efficiency of the air cooler. How do we defrost the air cooler?

Artificial sweeping

The method of removing the frosting directly on the surface of the evaporator by the operator with the removal tool is called manual cleaning. Generally only applicable to the defrost of wall and top tubes of frozen refrigerators. The frozen storage room is a long-term inventory of refrigerated rooms. The pipes are at the top of the goods or in the vicinity of the goods. If hot air melting or electric heating is used, the melting of the frost will not only make the items damp, but also stick the pieces into pieces. The recovery of the library temperature will also damage the storage quality of the food. Therefore, the tube in the freezing room of the frozen product should not be defrosted by the method of "melting" frost, and the water cream is even more unacceptable.

The characteristic of manual defrosting is that the frost does not melt. During the defrosting process, the evaporator can work normally as well, and it does not affect the constant temperature of the warehouse. Therefore, it is most suitable for the defrosting of the tube in the freezing compartment. However, when the frost is melted, the personnel must enter the warehouse to operate, the working conditions are poor, and the heating and cooling costs and labor costs of the personnel should be increased.

There is also a balance between labor costs and operating expenses. Due to the different types of goods stored in each refrigeration plant, the packaging situation is different, and the speed of frosting of the pipes varies greatly. Therefore, the time interval of manual defrost can only be determined according to the specific conditions. The scientific practice is to apply the frost layer. The thickness provides a comprehensive and economical defrost cycle by comprehensively analyzing and comparing the operating electricity cost and the defrosting labor cost of the system. The specific analysis idea is that the accumulated operating cost of the frost layer thermal resistance in a reasonable defrost cycle is exactly equal to the labor cost of a defrosting.

Ethylene glycol defrosting:

The refrigerator uses a hot glycol defrosting method, which uses the heat generated by the compressor exhaust to heat and store the glycol in the heat exchanger to the storage tank, and the pump needs to be defrosted (cooling fan, aluminum tube). The evaporator is closed at the same time as the normal night and return valves. When the temperature of the evaporator rises, the frosting layer on the surface of the evaporator is melted or peeled off; the pre-cooling tank adopts a hot air melting method, which sends the high-pressure high-temperature gas discharged from the compressor to the evaporator to release the heat and defrost. The method of melting frost is economical and reliable, and the maintenance and management is convenient, and its investment and construction are not difficult.

Electric defrosting:

The electric defrosting is to heat the fins by using an electric heating tube arranged in the cooling fan to melt the frost layer. This method is simple in system and more convenient in operation. However, the cooling heat exchanger has an electric heating tube of about 40~100W per square heat exchange area, which consumes too much electricity, and has a great influence on the fluctuation of the storage temperature. The power of the frost electric heating tube is very large, the quality of the heating tube is not good or the use time is long, it is easy to burn out or even cause a fire, and the electric heating and defrost has serious safety hazards.

Water frosting:

Water flushing is a method of spraying water onto the outer surface of the evaporator by means of a water pump or a water spray device, so that the frost layer is melted and washed away by the heat of the water. Water rushing is a very effective defrosting method because of its simple operation and short time. In a cold storage with a very low temperature, after repeated frosting, the water temperature is too low, which will affect the effect of the frosting; if the frost is not cleaned within the set time, the frost layer may change after the cooling fan works normally. Forming an ice layer makes it harder to make the next frost.

Thermal working cream:

The hot working fluid defrosting is a superheated refrigerant vapor with a higher temperature discharged by a compressor. After passing through the oil separator, it enters the evaporator, temporarily uses the evaporator as a condenser, and uses the heat released by the hot working fluid to condense. , the frost layer on the surface of the evaporator is melted. At the same time, the refrigerant and lubricating oil originally accumulated in the evaporator are pressurized or transferred by gravity into a defrost drain bucket or a low-pressure circulation bucket. When the hot gas is defrosted, the load of the condenser is reduced, and the operation of the condenser can also save part of the electric energy. It can be seen that the thermal defrosting is the most economical way of defrosting the air cooler.